Dental syringe



H. HAGEMEIER DENTAL SYRINGE Dec. 21, 1937.

Filed July 28, 1936 Ewan/for Patented Dec. 21, 1937 UNITED" sTA rss rAEn'r orrics 2,102,591, v DENTAL synmenl Heinrich Hagemeier, Hamburg,Germany Application July28, 1936, Serial No. 93,050

. In Germany June 5, 1935.

- '3 Claims. -(ci. l28--236) This invention relatesto a syringe of thekind wherein the plunger or piston is operated by means of a pair ofhand grips in the same .way as tongs and pliers. Such syringes arealready in use by dentists for. administering narcotics, the plungerbeing in this case pivotally connected to the hand grip or grips, sothat the position of the plunger relative to the operating elementsremains constant. The object of the present invention is to obtain asyringe of this kind which allows of a gradual, stepwise discharge ofits contents in predetermined quantities, and the invention consists inproviding the syringe for this purpose with a plunger in the form of ascrew spindle on which the operating elements actthrcugh the medium ofan adjustable nut by which the posi--' tion of the plunger within thebarrel of the syringe can be regulated. The barrel is made long enoughto allow the plunger to advance in the barrel in a plurality ofsuccessive steps. I

With this construction of the syringe it is advisable to charge thelatter with material through the medium of previously filled capsulesfrom.

which the contents can thus be extruded step- Wise by means of theplunger through a nozzle secured to the barrel or to the capsule, meansbeing provided for admitting the capsule into the barrel either throughthe end of the latter or through lateral openings therein, and meansbeing also provided for securing the capsule in position. In this mannerthe contents will be hygienically protected from outside influences. Theplunger can be made to act on a piston which is fitted in the capsule asa closure for the latter and which may be connected to the plunger.

The capsule may be charged with tooth-filling cement in which case thecement can be transferred from the syringe directly into the toothcavity and forced into the latter by a pressure on the hand grips. Acomplete and reliable filling of the tooth can thus be effected in avery short space of time without the introduction into the cavity of anyfilling instruments by which it may be contaminated and before any flowof saliva into the cavity can take place.

The syringe may be fitted with a bent extrusion nozzle which can beadjusted to the most convenient angle relative to the hand grips.

Fig. l of the accompanying drawing represents by way of example asectional view of a syringe constructed according to the invention, and

Fig. 2 is an elevation thereof at right angles to Fig. 1.

The illustrated syringe comprises a body which is formed integrally witha hand grip I4 and able abutment.

which holds ona pivot i5 another hand grip l3 arranged in substantialsymmetry with the hand grip i l so that the syringe can be operated bymeans of the hand grips in the same way as a pair of pliers. Secured tothe body opposite the hand grips is a barrel it in which a plunger inthe form of a screw spindle ll is adapted to operate. The plunger isguided in a bore 28 in the body, and a widened portion is of this boreaccommodates a headed nut is arranged adjustably on the screw spindle.The pivoted hand grip i3 is provided with a nose piece It which ispreferably forked for accommodating the spindle and which engages underthe head of the nut 89 so as to support it in opposition to a spring 25which bears at one end against a shoulder 22 in the body and 'at theother end against the head of the nut. The spring tends to maintain thehand grip in its outer end position which is determined by a suit- Byholding the hand grips and pressing them together, the grip l 3 will beturned about its pivot, and the plunger ll will be displaced inopposition to the spring 28 for extruding material from the barrel, themaximum displacement being determined by the abutment of the nut Itagainst the shoulder 22. After each suchdisplacement, the spindle H isscrewed forwards in'the nut by means of a milled head 23 for theextrusion of a fresh charge, the barrel being made long enough to allowa plurality of The syringe can conveniently be used for filling teethwith cement, and the latter can then be supplied in capsules such as 2%adapted for insertion into the barrel ill either through the outer endthereof or through lateral openings 25. A screw cap I I adapted to bearsnugly against a conical end portion 29 of the capsule, is screwed on tothe end of the barrel for securing the capsule to the latter. In theillustrated arrangement the capsule is fitted with a screw nipple forthe reception of an extrusion nozzle l2 which is bent and adjustable sothat it can be set at the most convenient angle relative to the handgrips l3, Id. For the extrusion of the cement from the capsule, a piston26 may be employed to which the plunger H may be connected by means of aball joint, the ball 21 being attached to or formed with direct with thepiston for theextrusion thereof.

The spindle I! may be adapted to bear against the piston Without beingconnected thereto. Moreover, the connection of the nozzle I2 to the 7capsule 24 or to the barrel may be effected by other meansthanthosedescribed and illustrated;

and bothihand grips may be pivoted for the operation of the plunger. V r

V I claim: r

1. A dental syringe of the character described comprising a supportingbody, a barrel secured to said body, a plunger in the form of a screwspindle! guided longitudinally in said body and in the barrel, a nut onsaid spindle, a pair of hand grips on the body branching out from thelatter at opposite sides of and substantially symmetrically with thespindle, and a lever operable by pressure on the hand grips at rightangles to the spindle to engage said headed nut for the displacementofthe plunger. 7 V V 2. A dental syringe'of the character describedcomprising a supporting body, a barrel on said a body, a plunger in theform of a screw spindle guided longitudinally in said body for operationwithin the barrel, a. headed tint on said 7 spindle accommodated in arecess in the body and adapted ;to co-operate with the latter forlimiting the displacement and regulating the position of the plungerwithin, the barreL'a pair/of hand grips on the body branching out fromthe latter at V opposite sides of and substantially symmetrically withthe spindle, one of said hand grips forming a lever operablebypressureonv the'hand grips at rightangles to. the. spindle to engage saidnut forthe displacement of the spindle within the barrel,

and a spring arranged between thebody and the 7 head of the nut foropposing the displacement of the-plunger by said lever.

1 3r The structure claimed in claim 2 in combi- 'nationwitha'capsuleadapted to be accommodated in the barrel, means forsecuring'the capsule to the barrel, a nozzle adapted for attachment tothebarrel, a piston in the capsule, and a

